html, body {width:100%;height:100%;} /*非常重要的样式让背景图片100%适应整个屏幕*/
.bg {display: table;width: 100%;height: 100%;padding: 100px 0;text-align: center;color: #fff;background: url(http://www.xiandanke.cn/Image/intro-bg.jpg) no-repeat bottom center;background-color: #000;background-size: cover;}
.my-navbar {padding:20px 0;transition: background 0.5s ease-in-out, padding 0.5s ease-in-out;}
.my-navbar a{background:transparent !important;color:#fff !important}
.my-navbar a:hover {color:#45bcf9 !important;background:transparent;outline:0}
.my-navbar a {transition: color 0.5s ease-in-out;}/*-webkit-transition ;-moz-transition*/
.top-nav {padding:0;background:#000;}
button.navbar-toggle {background-color:#fbfbfb;}/*整个背景都是transparent透明的，会看不到，所以再次覆盖一下*/
button.navbar-toggle > span.icon-bar {background-color:#dedede}
